Scientific ResearchAt the beginning of 21st century, we can hardly imagine living without many electric devices, they have made it easier for us to work in the office and at home. However, we do not realize that they are also a source of very harmful positive ions the so called ELECTRIC SMOG.Electric smog deteriorates the condition of air, which hazardously affects our physical and emotional state.Sources of harmful positive ions are:.computer monitors.TV sets.Electric heaters.Dryers.Vacuum cleaners.Microwave ovens.Tobacco smokeScientific tests have revealed that the ratio of negative to positive ions should be between 1.02 to 0.98.http://tinyurl.com/ww01621 (http://folkthemes.com/salt-lamps/)